Autoadvancing gallery animation

I have a Gallery widget set up to auto advance every 10000ms. However the transition between views is instantaneous and I would prefer to have a transition.

My advancing method is like so:

private void tickerAdvance() {
    int selectedItemPosition = mTickerGallery.getSelectedItemPosition();
    if (selectedItemPosition + 1 == mTickerGallery.getCount()) {
        mTickerGallery.setSelection(0, true);
    } else {
        mTickerGallery.setSelection(selectedItemPosition + 1, true);
   开发者_JAVA百科 }
}

I was under the impression that setting the animation to true would cause it to animate between states. In my XML I've also added animationDuration="500", however the transition still pops between states instantly.

The problem is because you have used the setSelection() which obviously won't give you the feel of an Gallery being scrolled. SO instead of using setSelection() you have to override the onScroll() of gallery.

Here is how you do it.

Assuming that you have made the necessary steps for auto advancing periodically, now do this code.

MotionEvent e1, e2;
gallery.onScroll(e1, e2, scroll_limit   , 0);    //scroll limit is your integer variable for scroll limit.

The answer I came up with is that the Gallery API is terribly non-extensible. There are multiple package private or private methods that would unlock this functionality without a kludge including moveNext, FlingRunnable.startwithdistance, and scrollToChild. Alas, they are all unavailable.

Instead the best answer I was able to come up with was to override setSelection to get all the behaviors I needed. In the setSelection method I reverse the deceleration algorithm to calculate a velocity for a calculated distance and then call onFling. This is a nasty kludge could be made a ton better by making any of the above methods protected or public (I can't fathom a reason why at least moveNext and scrollToChild shouldn't be).

i had a similar task to make item to item animation and i decided to choose gallery, so i tried a lot of things, but the best way is to subclass gallery and add this:

boolean avoidSound = false;

public void showNext() {
    avoidSound = true;
    this.onKeyDown(KeyEvent.KEYCODE_DPAD_RIGHT, null);
}


public void playSoundEffect(int soundConstant) {
    if (avoidSound) {
        avoidSound = false;
    } else {
        super.playSoundEffect(soundConstant);
    }
}

just call showNext() and it will do an animation